关键词: 局部根区灌水, 氮肥, 玉米, 导水率

Abstract: 【Objective】The effects of partial rootzone irrigation and nitrogen fertilizer on hydraulic conductivity of root and shoot of maize.【Method】Take No.9 ShanDan maize as experiment material, we adopted the High Pressure Flow Meter (HPFM for short) which made by US Dynamax Company to measure hydraulic conductivity (K) of maize. The irrigation ways included: fixed partial rootzone irrigation and alternate partial rootzone irrigation. For each irrigation method, water was supplied by three levels: sufficient irrigation, milder deficiency irrigation and serious deficiency irrigation. Three nitrogen levels: high, moderate and low nitrogen with pure nitrogen per kg soil 0.3g, 0.2g, 0.1g respectively.【Result】The result showed that there are remarkable differences between two irrigation ways. The K value under AI is greater than under FI. The effect of water, nitrogen on crown and root K of maize achieved the extremely remarkable level. And there is a larger K value in jointing stage.【Conclusion】The K value increases with the increase of water content, nitrogen fertilizer can enhance moisture content absorption of maize under the condition that the fertilizer does not burn out seedling. Alternate irrigation can promote the capacity of hydraulic conductivity more effectively than fixed irrigation and thus can enhance water absorption and efficiency of water utilization. For this reason, the advantage can obviously display under the proper condition where in arid and semi-arid area.

Key words: Partial rootzone irrigation, Nitrogen fertilizer, Maize, Hydraulic conductivity